chore: update README.md to include example for hierarchical configuration data.

Author: ashishdhingra

README.md

@@ -144,6 +144,35 @@ public class SampleLambda
 }
 ```
 
+# Hierarchical configuration data
+Let's assume we want to load configuration per the below class hierarchy:
+```csharp
+public class DemoConfig
+{
+    public string TestItem { get; set; }
+    public DemoSubConfig SubConfig { get; set; }
+}
+
+public class DemoSubConfig
+{
+    public string SubItem { get; set; }
+}
+```
+In System Manager parameter store, these hierarchical values could be represented with below names (notice the use of `/` delimiter):
+| Name    | Type |
+| :-------- | :------- |
+| /my-application/Config/TestItem  | String    |
+| /my-application/Config/SubConfig/SubItem | String     |
+
+Using `WebApplicationBuilder` as an example, the above configuration hierarchy could be loaded using below code:
+```csharp
+var builder = WebApplication.CreateBuilder(args);
+
+builder.Configuration.AddSystemsManager($"/my-application/");
+
+builder.Services.Configure<DemoConfig>(builder.Configuration.GetSection("Config"));
+```
+
 ## Samples
 
 ### Custom ParameterProcessor Sample